Re: modeless dialog and memory leak - C / C++ / MFC Discussion Boards

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Re: Ignoring & character

Ravi Bhavnani16-May-02 10:14

Ravi Bhavnani

16-May-02 10:14

Select the "No prefix" style of the offending control static text control. This will cause ampersands to be displayed normally, instead of underscoring the following character.

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Re: Ignoring & character

Steve L.16-May-02 10:28

Steve L.

16-May-02 10:28

thx alot

-Raffi

modeless dialog and memory leak

16-May-02 9:22

I want to display a dialog as a modeless one. And my code is:

CMyDialog *pDlg;
pDlg = new CMyDialog();
if ( pDlg != NULL )
    if ( pDlg->Create(IDD_DLG_MY, this) )
        pDlg->ShowWindow(SW_SHOW);

but where should I delete the pDlg? If I don't delete it, it causes memory leak.

Thank you very much!

Re: modeless dialog and memory leak

C^hris L^osinger16-May-02 9:32

C^hris L^osinger

16-May-02 9:32

make pDlg a member variable of the class that creates it. then delete pDlg in the destructor for the owning class.

-c

ABSURDITY:
A statement or belief manifestly inconsistent with one's own opinion.

ISEffects - effects for images

Re: modeless dialog and memory leak

redeemer16-May-02 9:34

redeemer

16-May-02 9:34

After you have destroyed the window. Or not using it anymore i would think...

Re: modeless dialog and memory leak

Tim Smith16-May-02 10:02

Tim Smith

16-May-02 10:02

Modeless dialogs are usually deleted in the OnNcDestroy routine. Just add that message handler and do a "delete this".

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Re: modeless dialog and memory leak

lucy16-May-02 11:02

lucy

16-May-02 11:02

Hi Tim, I add the following code to myView:
in myView.h:
afx_msg void OnNcDestroy();
in myView.cpp:
ON_COMMAND(WM_NCDESTROY, OnNcDestroy)

void CMyView::OnNcDestroy()
{
delete this;
CScrollView::OnNcDestroy();
}

But it is not called. And the memory leak is till there. How should I did it?

Re: modeless dialog and memory leak

Christian Graus16-May-02 12:02

Christian Graus

16-May-02 12:02

You should add this code to your DIALOG. delete this.....

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

And you don't spend much time with the opposite sex working day and night, unless the pizza delivery person happens to be young, cute, single and female. I can assure you, I've consumed more than a programmer's allotment of pizza, and these conditions have never aligned. - Christopher Duncan - 18/04/2002

Re: modeless dialog and memory leak

lucy16-May-02 12:59

lucy

16-May-02 12:59

Got it. Get it working now. No memory leaking, no warning. Thank all of you a lot!

Re: modeless dialog and memory leak

Jason Henderson16-May-02 11:36

Jason Henderson

16-May-02 11:36

Do you need to use a pointer?

CMyDialog Dlg;
if (Dlg.Create(IDD_DLG_MY, this))
   Dlg.ShowWindow(SW_SHOW);

Like it or not, I'm right.

Re: modeless dialog and memory leak

Nish Nishant16-May-02 14:39

Nish Nishant

16-May-02 14:39

Read this :-

http://www.codeproject.com/useritems/gettingmodeless.asp

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Re: modeless dialog and memory leak

lucy17-May-02 3:20

lucy

17-May-02 3:20

Nice article. Thank you! Rose | [Rose]

How do i catch events from a ListView control?

redeemer16-May-02 9:26

redeemer

16-May-02 9:26

Click, ItemSelect, etc.?

I've noticed that when you click it or do some action on it, i don't get a WM_COMMAND message and i don't get the name of the control in the wParam parameter.

Thanks

Re: How do i catch events from a ListView control?

Ravi Bhavnani16-May-02 10:57

Ravi Bhavnani

16-May-02 10:57

Select the control in ClassWizard and choose a notify message handler for the appropriate notification.

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Still having problems double buffering a CListView MDI

RobJones16-May-02 8:09

RobJones

16-May-02 8:09

Hello,
Here is some code.. I am trying to double buffer my CListView MDI app.. I am getting all kinds of really weird drawing.. Alot of this code is from a CListCtrl double buffer.. I am trying to use it.. Anyone want to see if they can find some problems.. Thanks!!!

// This is my OnPaint()
CRect  rc;
	GetParent()->GetClientRect(&rc);

	if (rc.Size() == CSize(0,0))
		return;

	CPaintDC dc(this);
	CDC     MemoryDC;
	CBitmap Bitmap;
	CBrush  Brush;

	CRect rcWnd;
	GetWindowRect(&rcWnd);
	int rcWndW = rcWnd.Width(), rcWndH = rcWnd.Height();

	// Paint to a compatible DC
	MemoryDC.CreateCompatibleDC(&dc);
	Bitmap.CreateCompatibleBitmap(&dc, rcWndW, rcWndH);
	CBitmap *pOldBitmap = MemoryDC.SelectObject(&Bitmap);
   
	// Fill background (does what WM_ERASEBKGND would do)
	Brush.CreateSolidBrush(RGB(255,255,255));//GetBkColor());
	MemoryDC.FillRect(&CRect(0,0, rcWndW,rcWndH), &Brush);

	// Hook the header control so that paint gets redirected
	// to the memory dc
	CWMPaintHook  hookHeaderCtrl(GetListCtrl().GetHeaderCtrl()->GetSafeHwnd(), MemoryDC);

	// Do client and children areas first otherwise system
	// scrollbars don't draw correctly.
	Print(&MemoryDC, PRF_CLIENT|PRF_CHILDREN);
	Print(&MemoryDC, PRF_NONCLIENT);

	// Offset the MemoryDC drawing rectangle by rcBounds 
	CRect rcDraw = rc - rc.TopLeft();

	// Dump bits to real device context.
	dc.BitBlt(rc.left,rc.top, rc.Width(),rc.Height(), &MemoryDC, rcDraw.left,rcDraw.top, SRCCOPY);

	MemoryDC.SelectObject(pOldBitmap);

If you need more code, like from my .h let me know and I'll post it.

Thanks,

Rob

Re: Still having problems double buffering a CListView MDI

RobJones16-May-02 8:19

RobJones

16-May-02 8:19

Never mind.. I just figured it out Smile | :)

Convert the string "(5/12)*8" to a number?

Tony Fontenot16-May-02 7:56

Tony Fontenot

16-May-02 7:56

Is there a class or function out there will let me pass in an string equation like "(5/12)*8" and have it return the answer as a double.

I am planning on writing a fuction to do this, but thought I would check here first.

Thanks in advance. Big Grin | :-D

***********************
Tony Fontenot
Recreational Solutions
tony@recsolutions.com
***********************

Re: Convert the string "(5/12)*8" to a number?

Matt Gullett16-May-02 8:15

Matt Gullett

16-May-02 8:15

What you want is an expression parser. There are several commercial ones available, but none I would recommend.

Alexander Berthold has published one here on CP, but I have not used it personally. It can be found here:

http://www.codeproject.com/cpp/cxtpackage.asp

Re: Convert the string "(5/12)*8" to a number?

C^hris L^osinger16-May-02 8:09

C^hris L^osinger

16-May-02 8:09

here's one: http://www.codeproject.com/cpp/functionparser.asp

-c

ABSURDITY:
A statement or belief manifestly inconsistent with one's own opinion.

Smaller Animals Software

Error when i try to use std::map

redeemer16-May-02 7:24

redeemer

16-May-02 7:24

When i write this

typedef map<int, string, less<int>, allocator<string> > strmap;

which is what the MSDN library sample does, then i get an error:

error C2143: syntax error : missing ';' before '<'

like it's not expecting the "<" even though when i write the <, one of those things appear that helps you find the parameters of a function...

What's wrong?

Thanks

Re: Error when i try to use std::map

Le centriste16-May-02 7:38

Le centriste

16-May-02 7:38

did you:

using namespace std;

typedef std::map<int, std::string, std::less<int>, std::allocator<std::string> > strmap;

Michel

It is a lovely language, but it takes a very long time to say anything in it, because we do not say anything in it, unless it is worth taking a very long time to say, and to listen to.

- TreeBeard

Re: Error when i try to use std::map

redeemer16-May-02 8:05

redeemer

16-May-02 8:05

it says that string isn't a member of std, can i write this instead?:

typedef std::map<int, char, std::less<int>, std::allocator<char> > strmap;

Re: Error when i try to use std::map

C^hris L^osinger16-May-02 8:07

C^hris L^osinger

16-May-02 8:07

that will associate an int with a single char.

try this:

#include <string>
#include <map>

typedef std::map<int, std::string> strmap;

-c

ABSURDITY:
A statement or belief manifestly inconsistent with one's own opinion.

Smaller Animals Software

One more question

redeemer16-May-02 8:26

redeemer

16-May-02 8:26

How do i retrieve the value again? How do i for example fill a char array with the value using strcpy?

Thankyou, your help has been greatly appreciated!

Re: One more question

C^hris L^osinger16-May-02 8:43

C^hris L^osinger

16-May-02 8:43

here's the lookup:

strmap::iterator it = myMap.find(intKey);
if (it!=myMap.end())
{
  //...found it. 

  // copy to a new char array

  char *pChar = new char[(*it).second.size() + 1];

  // "(*it).second" is the second param in the template (the value part of the map). in this case, it's a std::string

  strcpy(pChar, (*it).second.c_str());

  ...

  delete [] pChar;
}

-c

ABSURDITY:
A statement or belief manifestly inconsistent with one's own opinion.

Smaller Animals Software

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